Safety device for elevators.



B. & 0. E. BAUMER. SAFETY DEVICE FOR ELEVATORS. APPLIOATION FILED JUNE 5, 1911.

' 1 050 599. Patented Jan. 14,1913.

4 SHEETS-SHEET 1.

WITNESSES V NVENTO J M CLBXQHCG E. Baumev B. & G. E. BAUMER. SAFETY DEVICE FOR ELEVATORS.

APPLIUATION FILED 1111125, 1911.

Patented Jan. 14, 1918.

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SAFETY DEVICE FOR ELEVATORS.

APPLIOATION 1 111211111111: 5, 1911.

Patented Jan; 14,1913

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Q Befiha 'Atla e WITNESSES Q WW 1 B. & G. E. BAUMER.

SAFETY DEVICE FOR ELEVATORS.

APPLIOATION FILED JUNE 5, 1911.

1,050,599., I Patented Jan. 14, 1913.

4 SHEETSSHEET 4.

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Bevflw. Baumev q/vi-Mmooeo ii 62mm m s 111 CULUMXHA PLANDORAPH co., WASHINGTON. D. c.

UNITED STATES PATENT OFFICE.

BERTHA BAUMER, OF ATLANTA, GEORGIA, AND CLARENCE E. BAUMER, F TROY, OHIO.

SAFETY DEVICE FOR ELEVATORS.

Specification of Letters Patent.

Application filed June 5, 1911.

Patented Jan. 14, 1913.

Serial No. 631,220.

and CLARENCE E. BAUMER, citizens of the United States, the said BERTI-IA BAUMER residing at Atlanta, in the county of Fulton and State of Georgia, and the said CLAR- ENOE E. BAUMER residing at Troy, in the county of Miami and State of Ohio, have invented certain new and useful Improvements in Safety Devices for Elevators, of which the following is a specification,-reference being had therein to the accompanying drawings.

This invention relates to elevators and has special reference to elevator cars provided with safety devices to prevent the same from dropping to the bottom of an elevator well in case the hoisting rope breaks or from other causes.

The invention has for its object to provide an improved safety apparatus for elevator cars which will be set for operation by the breaking of the elevator cable.

The invention further has for its object to provide an improved safety apparatus for elevator cars which may be manually set for operation in case the elevator cable breaks.

The invention further has for its object to provide an improved safety apparatus for elevator cars which, with the breaking of the elevator cable, will be automatically set for operation when the speed of the flight of the elevator car increases.

Referring to the accompanying drawings:Figure 1 is a plan view looking at the underside of an elevator car located in an elevator shaft, and provided with an apparatus constructed in accordance with this invention. Fig. 2 is an enlarged detail view in horizontal section of a portion of an elevator car and a portion of a mechanism employed in connection with the safety apparatus. Fig. 3 is an enlarged detall vlew, partly in longitudinal section and broken away of a double air cylinder employed in connection with this invent-ion. Fig. 4 is a detail view in cross section on the line XX, Fig. 2. Fig. 5 is a detail view in cross section on the line YY, Fig. 2, showing a disk partly broken away. Fig. 6 is a detail view in vertical section of a portion of an elevator car partly broken away, and a portion of a safety apparatus mounted beneath said elevator car. Fig. 7 is a detail view in cross section of the lower portion of an elevator car and a portion of the safety apparatus constructed in accordance with this Invention mounted beneath the elevator car. Fig. 8 is a view of an elevator car and shaft, a diagram of the electrical connections being shown therewith.

In the accompanying drawings 1 indicates an elevator car having located at each side of the bottom thereof a rotary shaft 2 mounted in bracket bearings 3 and 4 secured to the bottom of the elevator car and connected at one end by a bevel gear wheel 5 with a toothed gear wheel 6 on the end of a shaft 7 extending transversely across the bottom of the elevator car. Pivotally mounted on an extension 8 of the bracket 3 is a large toothed wheel 9 meshing with a rack bar 10 on the side of the elevator shaft and extending from top to bottom thereof, said toothed gear wheel 9 also meshing with a smaller toothed gear wheel 10 secured to a sleeve 11 having a spline 12. Mounted on one end of the shaft 2 which normally is at rest in the sleeve 11 is a disk wheel 13 having an eccentric pivot pin 14; engaging a sleeve 15 on one'end of a lever arm 16 the other end of said arm 16 being pivotally connected to one end of a piston rod 17 connected to a piston 17 located in the double cylinder 18 divided midway between its ends by a partition 18.

The cylinder 18 is provided with four air valves 19 each of which is connected by a short lever arm 20 with a reciprocating bar 21 pivo-tally connected at one end to a short link 22, the other end of which is pivotally connected to one end of a bell crank lever 23 pivoted to the underside of the elevator car, the other end of said bell crank lever 23 being connected to the lower end of an operating lever 24 pivotally mounted in the ele-v vator car, as shown in Fig. 6, and projecting through the floor of the same. By means of this mechanism the valves 19 are opened by the lever2t when it is desired to operate the pistons in the cylinder 18.

Secured to the shaft 2'is a recessed head '26 with which is adapted to be engaged a clutch 27 engaging the spline 12 and slidable longitudinally on the sleeve 11. The clutch 27 is formed with a projection hav ing an annular groove 28 in which is mounted the arms of a fork 29 on one end of a bar 30 slidably mounted on the bottom of the elevator car and connected at its outer end to one end of a double arm lever 31 connected at its inner end with an arm 32 on a bar 33, slidably mounted on the bottom of the elevator car and having pivot-ally connected thereto a lever 34 projecting through the floor of the elevator car. The projection of the head 27 is formed with a second annular groove 35 having anannular socket 35 in which is located one end of a coil spring 36, said spring 36 encircling the sleeve 11, the other end of said spring 36 bearing against a disk 37 slidable longitudinally on the sleeve 11 and engaging the spline 12. The disk 37 is provided on its periphery with clutching pawls 38 pivoted thereto and each having a rear curved projection 39 hearing against a curved recess 40 in a disk 41 slidable longitudinally on the sleeve 11 and engaging the spline 12. The forward projecting ends of the pawls 38 normally engage the groove 35 in the projection of the clutch 27 and normally hold said clutch out of engagement with the socket head 26. In this position the rear projecting portion 39 of each pawl 38 is folded up in the recess 40 with a spring 43 connecting one end of said pawl with the disk 37 and in compressed position. In this position also the coil spring 36 will be held under tension.

The clutching pawls 38 are released from engagement with the project-ion of the clutch 27 by means of a fork 44 located in an annular groove 41 in the disk 41 said fork 44 being on the end of a slidable rod 45 to which is connected one end of a double arm lever 46 pivotally connected at its other end to a slidable contact bar 47 movable into and out of contact with an electro-magnet 48 on the bottom of the car.

The rods 45 are normally urged against the action of the magnet 48 by means of the springs 45 so that when the magnet is deenergized these rods move to throw the clutch into operation as hereinafter described. The disk 41 has projecting therefrom a socket member 50 in which is located a member 51 mounted on the sleeve 11. Mounted on each side of the socket member 50 on brackets 52 fixed on the member 51 to its outer end are governors 53 pivoted thereto and each having a projection 54 adapted to bear against and push said socket member 50 longitudinally when the governors are thrown outward by centrifugal force. By means of the construction hereinbefore set forth, the toothed wheel 9 on each side of the elevator car may be thrown into operative connection with the disk 13, the lever 16, piston rod 17 and the piston 17 as follows: Should the elevator cable break the electro-magnet 48 would be deenergized. The sliding bar'47 will thereupon be moved away from the magnet poles thereby,

through the lever connections with the clutches 27, throwing the latter into engagement with the socket heads, thus causing the disks 13 to rotate and actuate the pistons. Thus these pistons act as liquid brakes to retard the movement of the disks and consequently the movement of the car downward. It will be obvious that when the cable is again repaired connection will again be established through the magnet thus moving the parts back to their original position.

It will be obvious that the car may have the apparatus thrown in by hand, the lever 34 being provided for this purpose.

In case of the car running too fast either up or down, the cable not being broken, the governors 53 will be thrown out until by their action they force the socket member longitudinally and with it the disk 41, thereby relieving the clutching pawls from the clutch and permitting the action of the coil spring 36.

lVhat we claim is 1. In a safety mechanism for elevator cars, vertical racks extending from top to bottom of an elevator shaft, an elevator car,

a toothed wheel on each side thereof meshing with one of said racks, a hoisting cable, a shaft connected with each of said toothed wheels, a. shaft connecting said shafts, a double pneumatic cylinder, a piston and piston rod in each of the chambers of the double cylinder, a mechanism connecting each of said pistons with one of said toothed wheels, and means for automatically connecting said mechanism into operative engagement with said toothed wheel.

2. In a safety mechanism for elevator .cars, an elevator well, a vertical. rack bar 011 each side of said well extending from top to bottom thereof, an elevator car, a hoisting cable, a rotary shaft on each side of said car, said shafts being geared together, a toothed wheel meshing with one of said rack bars, a second toothed wheel mounted on each of said shafts and meshing with the respective one of the first toothed wheels, pneumatic means for retarding the rotation of said toothed wheels, and means for connecting the pneumatic means in operative engagement with said toothed wheels.

3. In a safety mechanism for elevator cars, an elevator well, a rack bar on each side thereof extending from top to bottom of the well, an elevator car, a hoisting cable, a rotary shaft on each side of said elevator car, said shafts being geared together, a toothed wheel loosely mounted on each of said shafts, a second toothed wheel geared to each of the first toothed wheels and meshing with one of said'rack bars, a rotary disk fixed to said shaft, pneumatic means connected with said rotary disks for retarding the rotation of said toothed wheels, and means for automatically electrically concar meshing with one of said toothed racks and normally out of engagement with one of said shafts, and means for automatically throwing each of said toothed wheels into operative connection with said shaft.

5. In a safety mechanism for elevator cars, an elevator well, a vertical rack bar on each side of said well, an elevator car, a hoisting cable, a rotary shaft on each side of said car, said shafts being geared together, a crank disk wheel mounted on said shaft, a double chambered pneumatic cylinder, a piston and piston rod in each of said chambers, each of the respective piston rods being connected with one of said crank disk wheels, a sleeve mounted on each of said shafts, a toothed gear wheel fixed to said sleeve, a toothed gear wheel meshing with each rack bar and with the respective gear wheel on said sleeve, and means electrically operated by the breaking of the hoisting cable to engage said sleeves with said shaft, and place said toothed wheels in operative connection with said pistons.

6. In a safety mechanism for elevator cars, an elevator well, a vertical rack bar on each side of said well, an elevator car, a hoisting cable, a rotary shaft on each side of said car, said shafts being geared together, a toothed gear wheel on each side of said car meshing with one of said rack bars, and normally out of operative engagement with the shaft at that side of the car, a double pneumatic cylinder, a piston and piston rod in each cylinder, a crank disk wheel on each of said shafts connected with one of said piston rods, a clutch for placing said toothed wheel in operative connection with said shaft on each side of the car, an electro-magnet on the car electrically connected with the hoisting cable, a slidable contact bar released by said electro-magnet upon the breaking of the cable, springs to move said contact bar when released and levers connecting said contact bar with said clutch on each of said shafts for operating said clutches.

7. In a safety mechanism for elevator cars, an elevator well, a vertical rack bar on each side of said well, an elevator car, a hoisting cable, arotary shaft on each side of said car, said shafts being geared together, a toothed gear wheel on each side of said car meshing with one of said rack bars, and normally out of operative engagement with said shaft, a double pneumatic cylinder, a piston and piston rod in each cylinder, a crank disk wheel on each of said shafts connected with one of said piston rods, a clutch for placing said toothed wheel in operative connection with said shaft on each side of the car, an electro-magnet on the car electrically connected with the hoisting cable, a slidable contact bar acted upon by said electromagnet upon the breaking of the cable, levers connecting said contact bar with said clutch on each of said shafts for operating said clutches, a set of valves on said double pneumatic cylinder and a set of levers connecting said valves manually controllable.

In testimony whereof we hereunto aifix our signature in presence of two witnesses.

BERTHA BAUMER. CLARENCE E. BAUMER.

Witnesses as to signature of Bertha Baumer:

WM. J. FRANKLIN,

LEON WILSON.

Witnesses as to signature of Clarence E. Baumer:

C. F. FAUs'r, PEARL C. PENCE.

coplel of this patent may be obtained for five cents each, by

addressing the Commissioner of Patents,

Washington, D. 0. 

